clacker

noun

1. A percussion instrument that makes a clacking noise.
2. (broadly)Any device that makes a clacking noise.
3. (UK, US, in-plural, often, slang, vulgar)A testicle.
4. (Australia, New-Zealand, slang, vulgar)The anus.

   “Someone tell me one thing that's good about sand. It gets so hot sometimes you can't even walk on it, it gets into your eyes when it's blowy, it gets stuck to the hairs on my back, it gets up your nose, in your ears and of course, worst of all, it gets up your clacker.”